.nav {
    display: flex;
    flex-wrap: wrap;
    /* justify-content: space-around; */
    padding: 10px;
}

.nav>div {
    width: 25%;
    margin-bottom: 10px;
}

.nav>div img {
    width: 60px;
}

/* .lunbo {
    height: 200px;
} */
.home{
    height: calc(100vh - 70px);
    overflow-y: scroll;
}